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CVE-2026-20184

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CVE-2026-20184

Published: Apr 15, 2026

Modified: Apr 16, 2026

PUBLISHED

CVSS v3.1

9.8

CRITICAL

Description

A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service. This vulnerability existed because of improper certificate validation. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by connecting to a service endpoint and supplying a crafted token. A successful exploit could have allowed the attacker to gain unauthorized access to legitimate Cisco Webex services.

VendorProductVersions

Cisco

Cisco Webex Meetings

affected
39.7.7
affected
39.9
affected
40.4.10
affected
39.6
affected
40.6.2

+51 more versions

Weaknesses (CWE)

CWE-295

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

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